//	---------------------------------------------------------------------------
//
//	@file		TwSimpleSDL.c
//	@brief		A simple example that uses AntTweakBar with OpenGL and SDL 1.2
//
//				AntTweakBar: http://anttweakbar.sourceforge.net/doc
//				OpenGL:		 http://www.opengl.org
//				SDL:		 http://www.libsdl.org
//
//	@author		Philippe Decaudin
//
//	---------------------------------------------------------------------------


#include <AntTweakBar.h>

#if defined(_WIN32) || defined(_WIN64)
//	MiniSDL12.h is provided to avoid the need of having SDL installed to
//	recompile this example. Do not use it in your own programs, better
//	install and use the actual SDL library SDK.
#	define USE_MINI_SDL
#endif

#ifdef USE_MINI_SDL
#	include "../src/MiniSDL12.h"
#else
#	include <SDL/SDL.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#if defined(_WIN32) || defined(_WIN64)
#	include <windows.h> // required by gl.h
#endif
#include <GL/gl.h>
#include <GL/glu.h>

// SDL redefines main
#ifdef main
#	undef main
#endif

int main()
{
	const SDL_VideoInfo* video = NULL;
	int width  = 640, height = 480;
	int bpp, flags;
	int quit = 0;
	TwBar *bar;
	int n, numCubes = 30;
	float color0[] = { 1.0f, 0.5f, 0.0f };
	float color1[] = { 0.5f, 1.0f, 0.0f };
	double ka = 5.3, kb = 1.7, kc = 4.1;

	// Initialize SDL, then get the current video mode and use it to create a SDL window.
	if( SDL_Init(SDL_INIT_VIDEO)<0 )
	{
		fprintf(stderr, "Video initialization failed: %s\n", SDL_GetError());
		SDL_Quit();
		exit(1);
	}
	video = SDL_GetVideoInfo();
	if( !video )
	{
		fprintf(stderr, "Video query failed: %s\n", SDL_GetError());
		SDL_Quit();
		exit(1);
	}
	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
	SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
	//SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 1);
	SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
	bpp = video->vfmt->BitsPerPixel;
	flags = SDL_OPENGL | SDL_HWSURFACE | SDL_RESIZABLE;
	//flags |= SDL_FULLSCREEN;
	if( !SDL_SetVideoMode(width, height, bpp, flags) )
	{
		fprintf(stderr, "Video mode set failed: %s\n", SDL_GetError());
		SDL_Quit();
		exit(1);
	}
	SDL_WM_SetCaption("AntTweakBar simple example using SDL", "AntTweakBar+SDL");

	// Enable SDL unicode and key-repeat
	SDL_EnableUNICODE(1);
	SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);

	// Set OpenGL viewport and states
	glViewport(0, 0, width, height);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0); // use default light diffuse and position
	glEnable(GL_NORMALIZE);
	glEnable(GL_COLOR_MATERIAL);
	glDisable(GL_CULL_FACE);
	glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);

	// Initialize AntTweakBar
	TwInit(TW_OPENGL, NULL);

	// Tell the window size to AntTweakBar
	TwWindowSize(width, height);

	// Create a tweak bar
	bar = TwNewBar("TweakBar");
	TwDefine(" GLOBAL help='This example shows how to integrate AntTweakBar with SDL and OpenGL.\nPress [Space] to toggle fullscreen.' "); // Message added to the help bar.

	// Add 'width' and 'height' to 'bar': they are read-only (RO) variables of type TW_TYPE_INT32.
	TwAddVarRO(bar, "Width", TW_TYPE_INT32, &width,
			   " label='Wnd width' help='Width of the graphics window (in pixels)' ");

	TwAddVarRO(bar, "Height", TW_TYPE_INT32, &height,
			   " label='Wnd height' help='Height of the graphics window (in pixels)' ");

	// Add 'numCurves' to 'bar': this is a modifiable variable of type TW_TYPE_INT32. Its shortcuts are [c] and [C].
	TwAddVarRW(bar, "NumCubes", TW_TYPE_INT32, &numCubes,
			   " label='Number of cubes' min=1 max=100 keyIncr=c keyDecr=C help='Defines the number of cubes in the scene.' ");

	// Add 'ka', 'kb and 'kc' to 'bar': they are modifiable variables of type TW_TYPE_DOUBLE
	TwAddVarRW(bar, "ka", TW_TYPE_DOUBLE, &ka,
			   " label='X path coeff' keyIncr=1 keyDecr=CTRL+1 min=-10 max=10 step=0.01 ");
	TwAddVarRW(bar, "kb", TW_TYPE_DOUBLE, &kb,
			   " label='Y path coeff' keyIncr=2 keyDecr=CTRL+2 min=-10 max=10 step=0.01 ");
	TwAddVarRW(bar, "kc", TW_TYPE_DOUBLE, &kc,
			   " label='Z path coeff' keyIncr=3 keyDecr=CTRL+3 min=-10 max=10 step=0.01 ");

	// Add 'color0' and 'color1' to 'bar': they are modifable variables of type TW_TYPE_COLOR3F (3 floats color)
	TwAddVarRW(bar, "color0", TW_TYPE_COLOR3F, &color0,
			   " label='Start color' help='Color of the first cube.' ");
	TwAddVarRW(bar, "color1", TW_TYPE_COLOR3F, &color1,
			   " label='End color' help='Color of the last cube. Cube colors are interpolated between the Start and End colors.' ");

	// Add 'quit' to 'bar': this is a modifiable (RW) variable of type TW_TYPE_BOOL32
	// (a boolean stored in a 32 bits integer). Its shortcut is [ESC].
	TwAddVarRW(bar, "Quit", TW_TYPE_BOOL32, &quit,
			   " label='Quit?' true='+' false='-' key='ESC' help='Quit program.' ");

	// Main loop:
	// - Draw some cubes
	// - Process events
	while( !quit )
	{
		SDL_Event event;
		int handled;

		// Clear screen
		glClearColor(0.5f, 0.75f, 0.8f, 1);
		glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

		// Set OpenGL camera
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(40, (double)width/height, 1, 10);
		gluLookAt(0,0,3, 0,0,0, 0,1,0);

		// Draw cubes
		for( n=0; n<numCubes; ++n )
		{
			double t = 0.05*n - (double)SDL_GetTicks()/2000.0;
			double r = 5.0*n + (double)SDL_GetTicks()/10.0;
			float c = (float)n/numCubes;

			// Set cube position
			glMatrixMode(GL_MODELVIEW);
			glLoadIdentity();
			glTranslated(0.6*cos(ka*t), 0.6*cos(kb*t), 0.6*sin(kc*t));
			glRotated(r, 0.2, 0.7, 0.2);
			glScaled(0.1, 0.1, 0.1);
			glTranslated(-0.5, -0.5, -0.5);

			// Set cube color
			glColor3f((1.0f-c)*color0[0]+c*color1[0], (1.0f-c)*color0[1]+c*color1[1], (1.0f-c)*color0[2]+c*color1[2]);

			// Draw cube
			glBegin(GL_QUADS);
				glNormal3f(0,0,-1); glVertex3f(0,0,0); glVertex3f(0,1,0); glVertex3f(1,1,0); glVertex3f(1,0,0); // front face
				glNormal3f(0,0,+1); glVertex3f(0,0,1); glVertex3f(1,0,1); glVertex3f(1,1,1); glVertex3f(0,1,1); // back face
				glNormal3f(-1,0,0); glVertex3f(0,0,0); glVertex3f(0,0,1); glVertex3f(0,1,1); glVertex3f(0,1,0); // left face
				glNormal3f(+1,0,0); glVertex3f(1,0,0); glVertex3f(1,1,0); glVertex3f(1,1,1); glVertex3f(1,0,1); // right face
				glNormal3f(0,-1,0); glVertex3f(0,0,0); glVertex3f(1,0,0); glVertex3f(1,0,1); glVertex3f(0,0,1); // bottom face
				glNormal3f(0,+1,0); glVertex3f(0,1,0); glVertex3f(0,1,1); glVertex3f(1,1,1); glVertex3f(1,1,0); // top face
			glEnd();
		}

		// Draw tweak bars
		TwDraw();

		// Present frame buffer
		SDL_GL_SwapBuffers();

		// Process incoming events
		while( SDL_PollEvent(&event) )
		{
			// Send event to AntTweakBar
			handled = TwEventSDL(&event, SDL_MAJOR_VERSION, SDL_MINOR_VERSION);

			// If event has not been handled by AntTweakBar, process it
			if( !handled )
			{
				switch( event.type )
				{
				case SDL_QUIT:	// Window is closed
					quit = 1;
					break;

				case SDL_VIDEORESIZE:	// Window size has changed
					// Resize SDL video mode
					width = event.resize.w;
					height = event.resize.h;
					if( !SDL_SetVideoMode(width, height, bpp, flags) )
						fprintf(stderr, "WARNING: Video mode set failed: %s\n", SDL_GetError());

					// Resize OpenGL viewport
					glViewport(0, 0, width, height);

					// Restore OpenGL states (SDL seems to lost them)
					glEnable(GL_DEPTH_TEST);
					glEnable(GL_LIGHTING);
					glEnable(GL_LIGHT0);
					glEnable(GL_NORMALIZE);
					glEnable(GL_COLOR_MATERIAL);
					glDisable(GL_CULL_FACE);
					glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);

					// TwWindowSize has been called by TwEventSDL,
					// so it is not necessary to call it again here.

					break;

				case SDL_KEYDOWN:
					if( event.key.keysym.sym==' ' ) // toggle fullscreen if Space key is pressed
					{
						flags ^= SDL_FULLSCREEN;
						SDL_SetVideoMode(800, 600, bpp, flags);

						// Push a resize event because SDL does not do it for us
						event.type = SDL_VIDEORESIZE;
						event.resize.w = 800;
						event.resize.h = 600;
						SDL_PushEvent(&event);
					}
					break;
				}
			}
		}
	} // End of main loop

	// Terminate AntTweakBar
	TwTerminate();

	// Terminate SDL
	SDL_Quit();

	return 0;
}

